deps: Upgrade Google Http Java Client to v2.0.2 (#3946)

Author: lqiu96

gapic-generator-java-pom-parent/pom.xml

@@ -29,7 +29,7 @@
  <javax.annotation-api.version>1.3.2</javax.annotation-api.version>
  <grpc.version>1.71.0</grpc.version>
  <google.auth.version>1.39.1</google.auth.version>
- <google.http-client.version>1.47.1</google.http-client.version>
+ <google.http-client.version>2.0.2</google.http-client.version>
  <gson.version>2.12.1</gson.version>
  <guava.version>33.5.0-jre</guava.version>
  <protobuf.version>3.25.8</protobuf.version>